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United States Patent | 5,071,202 |
Fabris ,   et al. | December 10, 1991 |
An anti-lock braking system system (ABS) pressure modulator is provided. The modulator includes a frame with a central bore fluidly exposed to a solenoid valve and to a vehicle wheel cylinder. A piston is slidably mounted within the central bore having a contact surface and a first predetermined position within the bore. A power device is actuated by a controller. A cam, moved by the power means, has a ramp surface in contact with the piston contact surface. The position of the piston within the wheel cylinder is determined by the position of the cam.
Inventors: | Fabris; Alroy G. (Mt. Clemens, MI); Pirrallo; Frank G. (Troy, MI); Umasankar; Guruswamy (Sterling Heights, MI); Shimanovski; Bruce S. (Southfield, MI); Shrivastava; Prakash C. (Troy, MI) |
Assignee: | General Motors Corporation (Detroit, MI) |
Appl. No.: | 572307 |
Filed: | August 27, 1990 |
Current U.S. Class: | 303/115.2; 303/113.1 |
Intern'l Class: | B60T 008/42 |
Field of Search: | 303/115,119,61 |
2270586 | Jan., 1942 | Jahant et al. | 188/152. |
3467441 | Sep., 1969 | Clark et al. | 303/115. |
3747990 | Jul., 1973 | Tanguy | 303/115. |
3942843 | Mar., 1976 | Tobiasz | 303/61. |
3942843 | Mar., 1976 | Tobiasz | 303/115. |
4715665 | Dec., 1987 | Ostwald | 303/115. |
4775196 | Oct., 1988 | Braschel et al. | 303/115. |
4822114 | Apr., 1989 | Klein | 303/115. |
4957330 | Sep., 1990 | Morikawa et al. | 303/115. |
Foreign Patent Documents | |||
2202018 | Sep., 1988 | GB. |